CVE-2026-64546

In the Linux kernel, the following vulnerability has been resolved:

drm/edid: fix OOB read in drmparsetiled_block()

drmparsetiledblock() casts the DisplayID block to a struct displayidtiledblock and reads the full fixed layout up to tile->topologyid[7] without checking block->numbytes. The DisplayID iterator only validates the declared payload length, so a crafted EDID can advertise a tiled-display block (tag DATABLOCKTILEDDISPLAY, or DATABLOCK2TILEDDISPLAYTOPOLOGY for v2.0) with a small numbytes at the end of a DisplayID extension. The read then runs past the end of the exact-sized kmemdup()'d EDID allocation, a heap out-of-bounds read.

Reject blocks shorter than the spec's 22-byte tiled payload before reading the fixed struct, as drmparsevesamsodata() already does.

BUG: KASAN: slab-out-of-bounds in drmedidconnectorupdate Read of size 2 at addr ffff888010077700 by task exploit/147 dumpstacklvl (lib/dumpstack.c:94 ...) printreport (mm/kasan/report.c:378 ...) kasanreport (mm/kasan/report.c:595) drmedidconnectorupdate (drivers/gpu/drm/drmedid.c:7581) bochsconnectorhelpergetmodes (drivers/gpu/drm/tiny/bochs.c:574) drmhelperprobesingleconnectormodes (drivers/gpu/drm/drmprobehelper.c:426) statusstore (drivers/gpu/drm/drmsysfs.c:219) ... vfswrite (fs/readwrite.c:595 fs/readwrite.c:688) ksyswrite (fs/readwrite.c:740)